PVC Tube Axial Compression Experiments Of Reinforced Concrete Column

PVC tube reinforced concrete column is built-in PVC pipes in the reinforced concrete column reinforced concrete composite column or outsourcing, including a PVC tube concrete with normal concrete, reinforcement cage casting composite structures. PVC tube reinforced concrete column can reduce the relative section size, increase the net construction space, at the same time improve the durability performance of concrete, to prevent the erosion of harmful substances, and PVC material price is low, can save steel, reduce cost. Under the same bearing capacity, and steel reinforced concrete (SRC) column or compared (CFS) concrete filled steel tube column, can greatly reduce steel consumption, good corrosion resistance, durable performance is good, have good cost performance, a lot of advantages of saving construction cost.This article is on the basis of experiment, the PVC tube of normal section of reinforced concrete column axial compression performance were analyzed, and the design of reinforced concrete column specimens with PVC tube section combination, form of longitudinal reinforcement reinforcement ratio, stirrup and stirrup ratio as the main parameters, including specimens of 15 height is 650 mm PVC reinforced concrete column specimens, use three section size the cylinder with a diameter of 315 mm and 250 mm,315 x250mm square column, use PVC pipe. Using mechanical pressure experiment lasted loading test method, using 0.5 mm/min speed control method of load displacement. By analyzing the results of different parameters of the axial compression test specimens. The research content and results are as follows:(1) the axial compression of PVC tube reinforced concrete column is researched, analyzed the PVC tube reinforced concrete column failure modes, ultimate axial compression bearing capacity of axial compression, displacement and the influence of load displacement of a relationship.(2) analysis of longitudinal reinforcement, spiral stirrups and square stirrups, PVC pipe outsourcing and lining on the PVC tube limited bearing capacity of reinforced concrete columns, the influence of the test results show that the increase of the longitudinal steel reinforcement ratio, stirrup reinforcement ratio of the increase of PCV pipe has certain improve ultimate bearing capacity of reinforced concrete column, the greater the core area of PCV pipe within a certain scope the higher the ultimate bearing capacity of reinforced concrete column. Test showed that PVC lining inside the concrete column specimens for improvement of the effect is better than PVC outsourcing concrete column.(3) In PVC pipe diameter, reinforcement ratio and longitudinal reinforcement PVC pipe outside increasing stirrup, under the influence of different factors, such as the PVC tube reinforced concrete column ductility and energy dissipation of axial compression. Experimental study showed that PVC pipe diameter must be within the scope of the increase, the increase of reinforcement ratio and longitudinal reinforcement PVC pipe outside increase spiral stirrups, both for PCV pipe played a certain role to improve the ductility of the reinforced concrete column.